const add = (a, b) => a + b;
const subtract = (a, b) => a - b;
const multiply = (a, b) => a * b;
const divide = (a, b) => a / b;

/* 模块化导出 */
// module.exports.add = add
// module.exports.subtract = subtract
// module.exports.multiply = multiply
// module.exports.divide = divide

/* 模块化导出 */
module.exports = {
  add,
  subtract,
  multiply,
  divide,
};
